1 /* BFD back-end data structures for ELF files.
2 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
27 #include "elf/common.h"
28 #include "elf/external.h"
29 #include "elf/internal.h"
32 /* The number of entries in a section is its size divided by the size
33 of a single entry. This is normally only applicable to reloc and
34 symbol table sections.
35 PR 9934: It is possible to have relocations that do not refer to
36 symbols, thus it is also possible to have a relocation section in
37 an object file, but no symbol table. */
38 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
40 /* If size isn't specified as 64 or 32, NAME macro should fail. */
43 #define NAME(x, y) x ## 64 ## _ ## y
46 #define NAME(x, y) x ## 32 ## _ ## y
51 #define NAME(x, y) x ## NOSIZE ## _ ## y
54 #define ElfNAME(X) NAME(Elf,X)
55 #define elfNAME(X) NAME(elf,X)
57 /* Information held for an ELF symbol. The first field is the
58 corresponding asymbol. Every symbol is an ELF file is actually a
59 pointer to this structure, although it is often handled as a
60 pointer to an asymbol. */
66 /* ELF symbol information. */
67 Elf_Internal_Sym internal_elf_sym;
68 /* Backend specific information. */
71 unsigned int hppa_arg_reloc;
77 /* Version information. This is from an Elf_Internal_Versym
78 structure in a SHT_GNU_versym section. It is zero if there is no
79 version information. */
80 unsigned short version;
84 struct elf_strtab_hash;
90 bfd_signed_vma refcount;
92 struct got_entry *glist;
93 struct plt_entry *plist;
96 struct elf_link_virtual_table_entry
98 /* Virtual table entry use information. This array is nominally of size
99 size/sizeof(target_void_pointer), though we have to be able to assume
100 and track a size while the symbol is still undefined. It is indexed
101 via offset/sizeof(target_void_pointer). */
105 /* Virtual table derivation info. */
106 struct elf_link_hash_entry *parent;
109 /* ELF linker hash table entries. */
111 struct elf_link_hash_entry
113 struct bfd_link_hash_entry root;
115 /* Symbol index in output file. This is initialized to -1. It is
116 set to -2 if the symbol is used by a reloc. */
119 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
120 -1 if this is not a dynamic symbol. */
121 /* ??? Note that this is consistently used as a synonym for tests
122 against whether we can perform various simplifying transformations
123 to the code. (E.g. changing a pc-relative jump to a PLT entry
124 into a pc-relative jump to the target function.) That test, which
125 is often relatively complex, and someplaces wrong or incomplete,
126 should really be replaced by a predicate in elflink.c.
128 End result: this field -1 does not indicate that the symbol is
129 not in the dynamic symbol table, but rather that the symbol is
130 not visible outside this DSO. */
133 /* If this symbol requires an entry in the global offset table, the
134 processor specific backend uses this field to track usage and
135 final offset. Two schemes are supported: The first assumes that
136 a symbol may only have one GOT entry, and uses REFCOUNT until
137 size_dynamic_sections, at which point the contents of the .got is
138 fixed. Afterward, if OFFSET is -1, then the symbol does not
139 require a global offset table entry. The second scheme allows
140 multiple GOT entries per symbol, managed via a linked list
141 pointed to by GLIST. */
142 union gotplt_union got;
144 /* Same, but tracks a procedure linkage table entry. */
145 union gotplt_union plt;
150 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
151 unsigned int type : 8;
153 /* Symbol st_other value, symbol visibility. */
154 unsigned int other : 8;
156 /* Symbol is referenced by a non-shared object (other than the object
157 in which it is defined). */
158 unsigned int ref_regular : 1;
159 /* Symbol is defined by a non-shared object. */
160 unsigned int def_regular : 1;
161 /* Symbol is referenced by a shared object. */
162 unsigned int ref_dynamic : 1;
163 /* Symbol is defined by a shared object. */
164 unsigned int def_dynamic : 1;
165 /* Symbol has a non-weak reference from a non-shared object (other than
166 the object in which it is defined). */
167 unsigned int ref_regular_nonweak : 1;
168 /* Dynamic symbol has been adjustd. */
169 unsigned int dynamic_adjusted : 1;
170 /* Symbol needs a copy reloc. */
171 unsigned int needs_copy : 1;
172 /* Symbol needs a procedure linkage table entry. */
173 unsigned int needs_plt : 1;
174 /* Symbol appears in a non-ELF input file. */
175 unsigned int non_elf : 1;
176 /* Symbol should be marked as hidden in the version information. */
177 unsigned int hidden : 1;
178 /* Symbol was forced to local scope due to a version script file. */
179 unsigned int forced_local : 1;
180 /* Symbol was forced to be dynamic due to a version script file. */
181 unsigned int dynamic : 1;
182 /* Symbol was marked during garbage collection. */
183 unsigned int mark : 1;
184 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
185 not currently set by all the backends. */
186 unsigned int non_got_ref : 1;
187 /* Symbol has a definition in a shared object.
188 FIXME: There is no real need for this field if def_dynamic is never
189 cleared and all places that test def_dynamic also test def_regular. */
190 unsigned int dynamic_def : 1;
191 /* Symbol is weak in all shared objects. */
192 unsigned int dynamic_weak : 1;
193 /* Symbol is referenced with a relocation where C/C++ pointer equality
195 unsigned int pointer_equality_needed : 1;
196 /* Symbol is a unique global symbol. */
197 unsigned int unique_global : 1;
199 /* String table index in .dynstr if this is a dynamic symbol. */
200 unsigned long dynstr_index;
204 /* If this is a weak defined symbol from a dynamic object, this
205 field points to a defined symbol with the same value, if there is
206 one. Otherwise it is NULL. */
207 struct elf_link_hash_entry *weakdef;
209 /* Hash value of the name computed using the ELF hash function.
210 Used part way through size_dynamic_sections, after we've finished
212 unsigned long elf_hash_value;
215 /* Version information. */
218 /* This field is used for a symbol which is not defined in a
219 regular object. It points to the version information read in
220 from the dynamic object. */
221 Elf_Internal_Verdef *verdef;
222 /* This field is used for a symbol which is defined in a regular
223 object. It is set up in size_dynamic_sections. It points to
224 the version information we should write out for this symbol. */
225 struct bfd_elf_version_tree *vertree;
228 struct elf_link_virtual_table_entry *vtable;
231 /* Will references to this symbol always reference the symbol
232 in this object? STV_PROTECTED is excluded from the visibility test
233 here so that function pointer comparisons work properly. Since
234 function symbols not defined in an app are set to their .plt entry,
235 it's necessary for shared libs to also reference the .plt even
236 though the symbol is really local to the shared lib. */
237 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
238 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
240 /* Will _calls_ to this symbol always call the version in this object? */
241 #define SYMBOL_CALLS_LOCAL(INFO, H) \
242 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
244 /* Common symbols that are turned into definitions don't have the
245 DEF_REGULAR flag set, so they might appear to be undefined. */
246 #define ELF_COMMON_DEF_P(H) \
248 && !(H)->def_dynamic \
249 && (H)->root.type == bfd_link_hash_defined)
251 /* Records local symbols to be emitted in the dynamic symbol table. */
253 struct elf_link_local_dynamic_entry
255 struct elf_link_local_dynamic_entry *next;
257 /* The input bfd this symbol came from. */
260 /* The index of the local symbol being copied. */
263 /* The index in the outgoing dynamic symbol table. */
266 /* A copy of the input symbol. */
267 Elf_Internal_Sym isym;
270 struct elf_link_loaded_list
272 struct elf_link_loaded_list *next;
276 /* Structures used by the eh_frame optimization code. */
281 /* If REMOVED == 1, this is the CIE that the FDE originally used.
282 The CIE belongs to the same .eh_frame input section as the FDE.
284 If REMOVED == 0, this is the CIE that we have chosen to use for
285 the output FDE. The CIE's REMOVED field is also 0, but the CIE
286 might belong to a different .eh_frame input section from the FDE. */
287 struct eh_cie_fde *cie_inf;
288 struct eh_cie_fde *next_for_section;
291 /* CIEs have three states:
293 - REMOVED && !MERGED: Slated for removal because we haven't yet
294 proven that an FDE needs it. FULL_CIE, if nonnull, points to
295 more detailed information about the CIE.
297 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
298 which may not belong to the same input section.
300 - !REMOVED: We have decided to keep this CIE. SEC is the
301 .eh_frame input section that contains the CIE. */
303 struct cie *full_cie;
304 struct eh_cie_fde *merged_with;
308 /* The offset of the personality data from the start of the CIE,
309 or 0 if the CIE doesn't have any. */
310 unsigned int personality_offset : 8;
312 /* True if we have marked relocations associated with this CIE. */
313 unsigned int gc_mark : 1;
315 /* True if we have decided to turn an absolute LSDA encoding into
316 a PC-relative one. */
317 unsigned int make_lsda_relative : 1;
319 /* True if we have decided to turn an absolute personality
320 encoding into a PC-relative one. */
321 unsigned int make_per_encoding_relative : 1;
323 /* True if the CIE contains personality data and if that
324 data uses a PC-relative encoding. Always true when
325 make_per_encoding_relative is. */
326 unsigned int per_encoding_relative : 1;
328 /* True if we need to add an 'R' (FDE encoding) entry to the
329 CIE's augmentation data. */
330 unsigned int add_fde_encoding : 1;
332 /* True if we have merged this CIE with another. */
333 unsigned int merged : 1;
336 unsigned int pad1 : 18;
339 unsigned int reloc_index;
342 unsigned int new_offset;
343 unsigned int fde_encoding : 8;
344 unsigned int lsda_encoding : 8;
345 unsigned int lsda_offset : 8;
347 /* True if this entry represents a CIE, false if it represents an FDE. */
348 unsigned int cie : 1;
350 /* True if this entry is currently marked for removal. */
351 unsigned int removed : 1;
353 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
354 augmentation data, and an associated byte to each of the CIE's FDEs. */
355 unsigned int add_augmentation_size : 1;
357 /* True if we have decided to convert absolute FDE relocations into
358 relative ones. This applies to the first relocation in the FDE,
359 which is against the code that the FDE describes. */
360 unsigned int make_relative : 1;
363 unsigned int pad1 : 4;
365 unsigned int *set_loc;
368 struct eh_frame_sec_info
372 struct eh_cie_fde entry[1];
375 struct eh_frame_array_ent
383 struct eh_frame_hdr_info
387 unsigned int fde_count, array_count;
388 struct eh_frame_array_ent *array;
389 /* TRUE if we should try to merge CIEs between input sections. */
390 bfd_boolean merge_cies;
391 /* TRUE if all .eh_frames have been parsd. */
392 bfd_boolean parsed_eh_frames;
393 /* TRUE if .eh_frame_hdr should contain the sorted search table.
394 We build it if we successfully read all .eh_frame input sections
395 and recognize them. */
399 /* Enum used to identify target specific extensions to the elf_obj_tdata
400 and elf_link_hash_table structures. Note the enums deliberately start
401 from 1 so that we can detect an uninitialized field. The generic value
402 is last so that additions to this enum do not need to modify more than
435 /* ELF linker hash table. */
437 struct elf_link_hash_table
439 struct bfd_link_hash_table root;
441 /* An identifier used to distinguish different target
442 specific extensions to this structure. */
443 enum elf_target_id hash_table_id;
445 /* Whether we have created the special dynamic sections required
446 when linking against or generating a shared object. */
447 bfd_boolean dynamic_sections_created;
449 /* True if this target has relocatable executables, so needs dynamic
451 bfd_boolean is_relocatable_executable;
453 /* The BFD used to hold special sections created by the linker.
454 This will be the first BFD found which requires these sections to
458 /* The value to use when initialising got.refcount/offset and
459 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
460 the values are refcounts. Set to init_got_offset/init_plt_offset
461 in size_dynamic_sections when the values may be offsets. */
462 union gotplt_union init_got_refcount;
463 union gotplt_union init_plt_refcount;
465 /* The value to use for got.refcount/offset and plt.refcount/offset
466 when the values may be offsets. Normally (bfd_vma) -1. */
467 union gotplt_union init_got_offset;
468 union gotplt_union init_plt_offset;
470 /* The number of symbols found in the link which must be put into
471 the .dynsym section. */
472 bfd_size_type dynsymcount;
474 /* The string table of dynamic symbols, which becomes the .dynstr
476 struct elf_strtab_hash *dynstr;
478 /* The number of buckets in the hash table in the .hash section.
479 This is based on the number of dynamic symbols. */
480 bfd_size_type bucketcount;
482 /* A linked list of DT_NEEDED names found in dynamic objects
483 included in the link. */
484 struct bfd_link_needed_list *needed;
486 /* Sections in the output bfd that provides a section symbol
487 to be used by relocations emitted against local symbols.
488 Most targets will not use data_index_section. */
489 asection *text_index_section;
490 asection *data_index_section;
492 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
493 struct elf_link_hash_entry *hgot;
495 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
496 struct elf_link_hash_entry *hplt;
498 /* A pointer to information used to merge SEC_MERGE sections. */
501 /* Used to link stabs in sections. */
502 struct stab_info stab_info;
504 /* Used by eh_frame code when editing .eh_frame. */
505 struct eh_frame_hdr_info eh_info;
507 /* A linked list of local symbols to be added to .dynsym. */
508 struct elf_link_local_dynamic_entry *dynlocal;
510 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
511 objects included in the link. */
512 struct bfd_link_needed_list *runpath;
514 /* Cached first output tls section and size of PT_TLS segment. */
516 bfd_size_type tls_size;
518 /* A linked list of BFD's loaded in the link. */
519 struct elf_link_loaded_list *loaded;
521 /* Short-cuts to get to dynamic linker sections. */
533 /* Look up an entry in an ELF linker hash table. */
535 #define elf_link_hash_lookup(table, string, create, copy, follow) \
536 ((struct elf_link_hash_entry *) \
537 bfd_link_hash_lookup (&(table)->root, (string), (create), \
540 /* Traverse an ELF linker hash table. */
542 #define elf_link_hash_traverse(table, func, info) \
543 (bfd_link_hash_traverse \
545 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
548 /* Get the ELF linker hash table from a link_info structure. */
550 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
552 #define elf_hash_table_id(table) ((table) -> hash_table_id)
554 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
555 #define is_elf_hash_table(htab) \
556 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
558 /* Used by bfd_sym_from_r_symndx to cache a small number of local
560 #define LOCAL_SYM_CACHE_SIZE 32
564 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
565 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
568 /* Constant information held for an ELF backend. */
570 struct elf_size_info {
571 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
572 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
574 /* The size of entries in the .hash section. */
575 unsigned char sizeof_hash_entry;
577 /* The number of internal relocations to allocate per external
579 unsigned char int_rels_per_ext_rel;
580 /* We use some fixed size arrays. This should be large enough to
581 handle all back-ends. */
582 #define MAX_INT_RELS_PER_EXT_REL 3
584 unsigned char arch_size, log_file_align;
585 unsigned char elfclass, ev_current;
586 int (*write_out_phdrs)
587 (bfd *, const Elf_Internal_Phdr *, unsigned int);
589 (*write_shdrs_and_ehdr) (bfd *);
590 bfd_boolean (*checksum_contents)
591 (bfd * , void (*) (const void *, size_t, void *), void *);
593 (bfd *, asection *, void *);
594 bfd_boolean (*swap_symbol_in)
595 (bfd *, const void *, const void *, Elf_Internal_Sym *);
596 void (*swap_symbol_out)
597 (bfd *, const Elf_Internal_Sym *, void *, void *);
598 bfd_boolean (*slurp_reloc_table)
599 (bfd *, asection *, asymbol **, bfd_boolean);
600 long (*slurp_symbol_table)
601 (bfd *, asymbol **, bfd_boolean);
603 (bfd *, const void *, Elf_Internal_Dyn *);
605 (bfd *, const Elf_Internal_Dyn *, void *);
607 /* This function is called to swap in a REL relocation. If an
608 external relocation corresponds to more than one internal
609 relocation, then all relocations are swapped in at once. */
610 void (*swap_reloc_in)
611 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
613 /* This function is called to swap out a REL relocation. */
614 void (*swap_reloc_out)
615 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
617 /* This function is called to swap in a RELA relocation. If an
618 external relocation corresponds to more than one internal
619 relocation, then all relocations are swapped in at once. */
620 void (*swap_reloca_in)
621 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
623 /* This function is called to swap out a RELA relocation. */
624 void (*swap_reloca_out)
625 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
628 #define elf_symbol_from(ABFD,S) \
629 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
630 && (S)->the_bfd->tdata.elf_obj_data != 0) \
631 ? (elf_symbol_type *) (S) \
634 enum elf_reloc_type_class {
636 reloc_class_relative,
641 struct elf_reloc_cookie
643 Elf_Internal_Rela *rels, *rel, *relend;
644 Elf_Internal_Sym *locsyms;
648 struct elf_link_hash_entry **sym_hashes;
650 bfd_boolean bad_symtab;
653 /* The level of IRIX compatibility we're striving for. */
661 /* Mapping of ELF section names and types. */
662 struct bfd_elf_special_section
666 /* 0 means name must match PREFIX exactly.
667 -1 means name must start with PREFIX followed by an arbitrary string.
668 -2 means name must match PREFIX exactly or consist of PREFIX followed
669 by a dot then anything.
670 > 0 means name must start with the first PREFIX_LENGTH chars of
671 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
677 enum action_discarded
683 typedef asection * (*elf_gc_mark_hook_fn)
684 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
685 struct elf_link_hash_entry *, Elf_Internal_Sym *);
687 struct elf_backend_data
689 /* The architecture for this backend. */
690 enum bfd_architecture arch;
692 /* The ELF machine code (EM_xxxx) for this backend. */
693 int elf_machine_code;
698 /* The maximum page size for this backend. */
701 /* The minimum page size for this backend. An input object will not be
702 considered page aligned unless its sections are correctly aligned for
703 pages at least this large. May be smaller than maxpagesize. */
706 /* The common page size for this backend. */
707 bfd_vma commonpagesize;
709 /* The BFD flags applied to sections created for dynamic linking. */
710 flagword dynamic_sec_flags;
712 /* A function to translate an ELF RELA relocation to a BFD arelent
714 void (*elf_info_to_howto)
715 (bfd *, arelent *, Elf_Internal_Rela *);
717 /* A function to translate an ELF REL relocation to a BFD arelent
719 void (*elf_info_to_howto_rel)
720 (bfd *, arelent *, Elf_Internal_Rela *);
722 /* A function to determine whether a symbol is global when
723 partitioning the symbol table into local and global symbols.
724 This should be NULL for most targets, in which case the correct
725 thing will be done. MIPS ELF, at least on the Irix 5, has
726 special requirements. */
727 bfd_boolean (*elf_backend_sym_is_global)
730 /* The remaining functions are hooks which are called only if they
733 /* A function to permit a backend specific check on whether a
734 particular BFD format is relevant for an object file, and to
735 permit the backend to set any global information it wishes. When
736 this is called elf_elfheader is set, but anything else should be
737 used with caution. If this returns FALSE, the check_format
738 routine will return a bfd_error_wrong_format error. */
739 bfd_boolean (*elf_backend_object_p)
742 /* A function to do additional symbol processing when reading the
743 ELF symbol table. This is where any processor-specific special
744 section indices are handled. */
745 void (*elf_backend_symbol_processing)
748 /* A function to do additional symbol processing after reading the
749 entire ELF symbol table. */
750 bfd_boolean (*elf_backend_symbol_table_processing)
751 (bfd *, elf_symbol_type *, unsigned int);
753 /* A function to set the type of the info field. Processor-specific
754 types should be handled here. */
755 int (*elf_backend_get_symbol_type)
756 (Elf_Internal_Sym *, int);
758 /* A function to return the linker hash table entry of a symbol that
759 might be satisfied by an archive symbol. */
760 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
761 (bfd *, struct bfd_link_info *, const char *);
763 /* Return true if local section symbols should have a non-null st_name.
764 NULL implies false. */
765 bfd_boolean (*elf_backend_name_local_section_symbols)
768 /* A function to do additional processing on the ELF section header
769 just before writing it out. This is used to set the flags and
770 type fields for some sections, or to actually write out data for
772 bfd_boolean (*elf_backend_section_processing)
773 (bfd *, Elf_Internal_Shdr *);
775 /* A function to handle unusual section types when creating BFD
776 sections from ELF sections. */
777 bfd_boolean (*elf_backend_section_from_shdr)
778 (bfd *, Elf_Internal_Shdr *, const char *, int);
780 /* A function to convert machine dependent ELF section header flags to
781 BFD internal section header flags. */
782 bfd_boolean (*elf_backend_section_flags)
783 (flagword *, const Elf_Internal_Shdr *);
785 /* A function that returns a struct containing ELF section flags and
786 type for the given BFD section. */
787 const struct bfd_elf_special_section * (*get_sec_type_attr)
790 /* A function to handle unusual program segment types when creating BFD
791 sections from ELF program segments. */
792 bfd_boolean (*elf_backend_section_from_phdr)
793 (bfd *, Elf_Internal_Phdr *, int, const char *);
795 /* A function to set up the ELF section header for a BFD section in
796 preparation for writing it out. This is where the flags and type
797 fields are set for unusual sections. */
798 bfd_boolean (*elf_backend_fake_sections)
799 (bfd *, Elf_Internal_Shdr *, asection *);
801 /* A function to get the ELF section index for a BFD section. If
802 this returns TRUE, the section was found. If it is a normal ELF
803 section, *RETVAL should be left unchanged. If it is not a normal
804 ELF section *RETVAL should be set to the SHN_xxxx index. */
805 bfd_boolean (*elf_backend_section_from_bfd_section)
806 (bfd *, asection *, int *retval);
808 /* If this field is not NULL, it is called by the add_symbols phase
809 of a link just before adding a symbol to the global linker hash
810 table. It may modify any of the fields as it wishes. If *NAME
811 is set to NULL, the symbol will be skipped rather than being
812 added to the hash table. This function is responsible for
813 handling all processor dependent symbol bindings and section
814 indices, and must set at least *FLAGS and *SEC for each processor
815 dependent case; failure to do so will cause a link error. */
816 bfd_boolean (*elf_add_symbol_hook)
817 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
818 const char **name, flagword *flags, asection **sec, bfd_vma *value);
820 /* If this field is not NULL, it is called by the elf_link_output_sym
821 phase of a link for each symbol which will appear in the object file.
822 On error, this function returns 0. 1 is returned when the symbol
823 should be output, 2 is returned when the symbol should be discarded. */
824 int (*elf_backend_link_output_symbol_hook)
825 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
826 asection *, struct elf_link_hash_entry *);
828 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
829 linker the first time it encounters a dynamic object in the link.
830 This function must create any sections required for dynamic
831 linking. The ABFD argument is a dynamic object. The .interp,
832 .dynamic, .dynsym, .dynstr, and .hash functions have already been
833 created, and this function may modify the section flags if
834 desired. This function will normally create the .got and .plt
835 sections, but different backends have different requirements. */
836 bfd_boolean (*elf_backend_create_dynamic_sections)
837 (bfd *abfd, struct bfd_link_info *info);
839 /* When creating a shared library, determine whether to omit the
840 dynamic symbol for the section. */
841 bfd_boolean (*elf_backend_omit_section_dynsym)
842 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
844 /* Return TRUE if relocations of targets are compatible to the extent
845 that CHECK_RELOCS will properly process them. PR 4424. */
846 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
848 /* The CHECK_RELOCS function is called by the add_symbols phase of
849 the ELF backend linker. It is called once for each section with
850 relocs of an object file, just after the symbols for the object
851 file have been added to the global linker hash table. The
852 function must look through the relocs and do any special handling
853 required. This generally means allocating space in the global
854 offset table, and perhaps allocating space for a reloc. The
855 relocs are always passed as Rela structures; if the section
856 actually uses Rel structures, the r_addend field will always be
858 bfd_boolean (*check_relocs)
859 (bfd *abfd, struct bfd_link_info *info, asection *o,
860 const Elf_Internal_Rela *relocs);
862 /* The CHECK_DIRECTIVES function is called once per input file by
863 the add_symbols phase of the ELF backend linker. The function
864 must inspect the bfd and create any additional symbols according
865 to any custom directives in the bfd. */
866 bfd_boolean (*check_directives)
867 (bfd *abfd, struct bfd_link_info *info);
869 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
870 input file that was not needed by the add_symbols phase of the
871 ELF backend linker. The function must undo any target specific
872 changes in the symbol hash table. */
873 bfd_boolean (*as_needed_cleanup)
874 (bfd *abfd, struct bfd_link_info *info);
876 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
877 linker for every symbol which is defined by a dynamic object and
878 referenced by a regular object. This is called after all the
879 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
880 function has been called. The hash table entry should be
881 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
882 defined in a section from a dynamic object. Dynamic object
883 sections are not included in the final link, and this function is
884 responsible for changing the value to something which the rest of
885 the link can deal with. This will normally involve adding an
886 entry to the .plt or .got or some such section, and setting the
887 symbol to point to that. */
888 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
889 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
891 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
892 after all the linker input files have been seen but before the
893 section sizes have been set. This is called after
894 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
895 bfd_boolean (*elf_backend_always_size_sections)
896 (bfd *output_bfd, struct bfd_link_info *info);
898 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
899 linker after all the linker input files have been seen but before
900 the sections sizes have been set. This is called after
901 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
902 It is only called when linking against a dynamic object. It must
903 set the sizes of the dynamic sections, and may fill in their
904 contents as well. The generic ELF linker can handle the .dynsym,
905 .dynstr and .hash sections. This function must handle the
906 .interp section and any sections created by the
907 CREATE_DYNAMIC_SECTIONS entry point. */
908 bfd_boolean (*elf_backend_size_dynamic_sections)
909 (bfd *output_bfd, struct bfd_link_info *info);
911 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
912 we keep to use as a base for relocs and symbols. */
913 void (*elf_backend_init_index_section)
914 (bfd *output_bfd, struct bfd_link_info *info);
916 /* The RELOCATE_SECTION function is called by the ELF backend linker
917 to handle the relocations for a section.
919 The relocs are always passed as Rela structures; if the section
920 actually uses Rel structures, the r_addend field will always be
923 This function is responsible for adjust the section contents as
924 necessary, and (if using Rela relocs and generating a
925 relocatable output file) adjusting the reloc addend as
928 This function does not have to worry about setting the reloc
929 address or the reloc symbol index.
931 LOCAL_SYMS is a pointer to the swapped in local symbols.
933 LOCAL_SECTIONS is an array giving the section in the input file
934 corresponding to the st_shndx field of each local symbol.
936 The global hash table entry for the global symbols can be found
937 via elf_sym_hashes (input_bfd).
939 When generating relocatable output, this function must handle
940 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
941 going to be the section symbol corresponding to the output
942 section, which means that the addend must be adjusted
945 Returns FALSE on error, TRUE on success, 2 if successful and
946 relocations should be written for this section. */
947 int (*elf_backend_relocate_section)
948 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
949 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
950 Elf_Internal_Sym *local_syms, asection **local_sections);
952 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
953 linker just before it writes a symbol out to the .dynsym section.
954 The processor backend may make any required adjustment to the
955 symbol. It may also take the opportunity to set contents of the
956 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
957 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
958 on those symbols which are defined by a dynamic object. */
959 bfd_boolean (*elf_backend_finish_dynamic_symbol)
960 (bfd *output_bfd, struct bfd_link_info *info,
961 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
963 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
964 linker just before it writes all the dynamic sections out to the
965 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
966 all dynamic symbols. */
967 bfd_boolean (*elf_backend_finish_dynamic_sections)
968 (bfd *output_bfd, struct bfd_link_info *info);
970 /* A function to do any beginning processing needed for the ELF file
971 before building the ELF headers and computing file positions. */
972 void (*elf_backend_begin_write_processing)
973 (bfd *, struct bfd_link_info *);
975 /* A function to do any final processing needed for the ELF file
976 before writing it out. The LINKER argument is TRUE if this BFD
977 was created by the ELF backend linker. */
978 void (*elf_backend_final_write_processing)
979 (bfd *, bfd_boolean linker);
981 /* This function is called by get_program_header_size. It should
982 return the number of additional program segments which this BFD
983 will need. It should return -1 on error. */
984 int (*elf_backend_additional_program_headers)
985 (bfd *, struct bfd_link_info *);
987 /* This function is called to modify an existing segment map in a
988 backend specific fashion. */
989 bfd_boolean (*elf_backend_modify_segment_map)
990 (bfd *, struct bfd_link_info *);
992 /* This function is called to modify program headers just before
994 bfd_boolean (*elf_backend_modify_program_headers)
995 (bfd *, struct bfd_link_info *);
997 /* This function is called before section garbage collection to
998 mark entry symbol sections. */
1000 (struct bfd_link_info *);
1002 /* This function is called during section garbage collection to
1003 mark sections that define global symbols. */
1004 bfd_boolean (*gc_mark_dynamic_ref)
1005 (struct elf_link_hash_entry *, void *);
1007 /* This function is called during section gc to discover the section a
1008 particular relocation refers to. */
1009 elf_gc_mark_hook_fn gc_mark_hook;
1011 /* This function, if defined, is called after the first gc marking pass
1012 to allow the backend to mark additional sections. */
1013 bfd_boolean (*gc_mark_extra_sections)
1014 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1016 /* This function, if defined, is called during the sweep phase of gc
1017 in order that a backend might update any data structures it might
1019 bfd_boolean (*gc_sweep_hook)
1020 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1022 /* This function, if defined, is called after the ELF headers have
1023 been created. This allows for things like the OS and ABI versions
1025 void (*elf_backend_post_process_headers)
1026 (bfd *, struct bfd_link_info *);
1028 /* This function, if defined, prints a symbol to file and returns the
1029 name of the symbol to be printed. It should return NULL to fall
1030 back to default symbol printing. */
1031 const char *(*elf_backend_print_symbol_all)
1032 (bfd *, void *, asymbol *);
1034 /* This function, if defined, is called after all local symbols and
1035 global symbols converted to locals are emitted into the symtab
1036 section. It allows the backend to emit special local symbols
1037 not handled in the hash table. */
1038 bfd_boolean (*elf_backend_output_arch_local_syms)
1039 (bfd *, struct bfd_link_info *, void *,
1040 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1041 struct elf_link_hash_entry *));
1043 /* This function, if defined, is called after all symbols are emitted
1044 into the symtab section. It allows the backend to emit special
1045 global symbols not handled in the hash table. */
1046 bfd_boolean (*elf_backend_output_arch_syms)
1047 (bfd *, struct bfd_link_info *, void *,
1048 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1049 struct elf_link_hash_entry *));
1051 /* Copy any information related to dynamic linking from a pre-existing
1052 symbol to a newly created symbol. Also called to copy flags and
1053 other back-end info to a weakdef, in which case the symbol is not
1054 newly created and plt/got refcounts and dynamic indices should not
1056 void (*elf_backend_copy_indirect_symbol)
1057 (struct bfd_link_info *, struct elf_link_hash_entry *,
1058 struct elf_link_hash_entry *);
1060 /* Modify any information related to dynamic linking such that the
1061 symbol is not exported. */
1062 void (*elf_backend_hide_symbol)
1063 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1065 /* A function to do additional symbol fixup, called by
1066 _bfd_elf_fix_symbol_flags. */
1067 bfd_boolean (*elf_backend_fixup_symbol)
1068 (struct bfd_link_info *, struct elf_link_hash_entry *);
1070 /* Merge the backend specific symbol attribute. */
1071 void (*elf_backend_merge_symbol_attribute)
1072 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1075 /* This function, if defined, will return a string containing the
1076 name of a target-specific dynamic tag. */
1077 char *(*elf_backend_get_target_dtag)
1080 /* Decide whether an undefined symbol is special and can be ignored.
1081 This is the case for OPTIONAL symbols on IRIX. */
1082 bfd_boolean (*elf_backend_ignore_undef_symbol)
1083 (struct elf_link_hash_entry *);
1085 /* Emit relocations. Overrides default routine for emitting relocs,
1086 except during a relocatable link, or if all relocs are being emitted. */
1087 bfd_boolean (*elf_backend_emit_relocs)
1088 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1089 struct elf_link_hash_entry **);
1091 /* Count relocations. Not called for relocatable links
1092 or if all relocs are being preserved in the output. */
1093 unsigned int (*elf_backend_count_relocs)
1094 (struct bfd_link_info *, asection *);
1096 /* This function, if defined, is called when an NT_PRSTATUS note is found
1098 bfd_boolean (*elf_backend_grok_prstatus)
1099 (bfd *, Elf_Internal_Note *);
1101 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1102 note is found in a core file. */
1103 bfd_boolean (*elf_backend_grok_psinfo)
1104 (bfd *, Elf_Internal_Note *);
1106 /* This function, if defined, is called to write a note to a corefile. */
1107 char *(*elf_backend_write_core_note)
1108 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1110 /* This function returns class of a reloc type. */
1111 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1112 (const Elf_Internal_Rela *);
1114 /* This function, if defined, removes information about discarded functions
1115 from other sections which mention them. */
1116 bfd_boolean (*elf_backend_discard_info)
1117 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1119 /* This function, if defined, signals that the function above has removed
1120 the discarded relocations for this section. */
1121 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1124 /* What to do when ld finds relocations against symbols defined in
1125 discarded sections. */
1126 unsigned int (*action_discarded)
1129 /* This function returns the width of FDE pointers in bytes, or 0 if
1130 that can't be determined for some reason. The default definition
1131 goes by the bfd's EI_CLASS. */
1132 unsigned int (*elf_backend_eh_frame_address_size)
1133 (bfd *, asection *);
1135 /* These functions tell elf-eh-frame whether to attempt to turn
1136 absolute or lsda encodings into pc-relative ones. The default
1137 definition enables these transformations. */
1138 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1139 (bfd *, struct bfd_link_info *, asection *);
1140 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1141 (bfd *, struct bfd_link_info *, asection *);
1143 /* This function returns an encoding after computing the encoded
1144 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1145 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1146 The default definition chooses a 32-bit PC-relative encoding. */
1147 bfd_byte (*elf_backend_encode_eh_address)
1148 (bfd *abfd, struct bfd_link_info *info,
1149 asection *osec, bfd_vma offset,
1150 asection *loc_sec, bfd_vma loc_offset,
1153 /* This function, if defined, may write out the given section.
1154 Returns TRUE if it did so and FALSE if the caller should. */
1155 bfd_boolean (*elf_backend_write_section)
1156 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1158 /* The level of IRIX compatibility we're striving for.
1159 MIPS ELF specific function. */
1160 irix_compat_t (*elf_backend_mips_irix_compat)
1163 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1164 (unsigned int, bfd_boolean);
1166 /* The swapping table to use when dealing with ECOFF information.
1167 Used for the MIPS ELF .mdebug section. */
1168 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1170 /* This function implements `bfd_elf_bfd_from_remote_memory';
1171 see elf.c, elfcode.h. */
1172 bfd *(*elf_backend_bfd_from_remote_memory)
1173 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1174 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
1176 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1178 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1180 /* Is symbol defined in common section? */
1181 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1183 /* Return a common section index for section. */
1184 unsigned int (*common_section_index) (asection *);
1186 /* Return a common section for section. */
1187 asection *(*common_section) (asection *);
1189 /* Return TRUE if we can merge 2 definitions. */
1190 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1191 struct elf_link_hash_entry **,
1192 struct elf_link_hash_entry *,
1193 Elf_Internal_Sym *, asection **,
1194 bfd_vma *, unsigned int *,
1195 bfd_boolean *, bfd_boolean *,
1196 bfd_boolean *, bfd_boolean *,
1197 bfd_boolean *, bfd_boolean *,
1198 bfd_boolean *, bfd_boolean *,
1200 bfd_boolean *, bfd_boolean *,
1201 bfd_boolean *, bfd_boolean *,
1202 bfd *, asection **);
1204 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1205 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1207 /* Return TRUE if type is a function symbol type. */
1208 bfd_boolean (*is_function_type) (unsigned int type);
1210 /* Used to handle bad SHF_LINK_ORDER input. */
1211 bfd_error_handler_type link_order_error_handler;
1213 /* Name of the PLT relocation section. */
1214 const char *relplt_name;
1216 /* Alternate EM_xxxx machine codes for this backend. */
1217 int elf_machine_alt1;
1218 int elf_machine_alt2;
1220 const struct elf_size_info *s;
1222 /* An array of target specific special sections. */
1223 const struct bfd_elf_special_section *special_sections;
1225 /* The size in bytes of the header for the GOT. This includes the
1226 so-called reserved entries on some systems. */
1227 bfd_vma got_header_size;
1229 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1230 otherwise by the local symbol with index SYMNDX in IBFD. */
1231 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1232 struct elf_link_hash_entry *h,
1233 bfd *ibfd, unsigned long symndx);
1235 /* The vendor name to use for a processor-standard attributes section. */
1236 const char *obj_attrs_vendor;
1238 /* The section name to use for a processor-standard attributes section. */
1239 const char *obj_attrs_section;
1241 /* Return 1, 2 or 3 to indicate what type of arguments a
1242 processor-specific tag takes. */
1243 int (*obj_attrs_arg_type) (int);
1245 /* The section type to use for an attributes section. */
1246 unsigned int obj_attrs_section_type;
1248 /* This function determines the order in which any attributes are
1249 written. It must be defined for input in the range
1250 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1251 is used in order to make unity easy). The returned value is the
1252 actual tag number to place in the input position. */
1253 int (*obj_attrs_order) (int);
1255 /* This is TRUE if the linker should act like collect and gather
1256 global constructors and destructors by name. This is TRUE for
1257 MIPS ELF because the Irix 5 tools can not handle the .init
1259 unsigned collect : 1;
1261 /* This is TRUE if the linker should ignore changes to the type of a
1262 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1263 record undefined functions as STT_OBJECT although the definitions
1265 unsigned type_change_ok : 1;
1267 /* Whether the backend may use REL relocations. (Some backends use
1268 both REL and RELA relocations, and this flag is set for those
1270 unsigned may_use_rel_p : 1;
1272 /* Whether the backend may use RELA relocations. (Some backends use
1273 both REL and RELA relocations, and this flag is set for those
1275 unsigned may_use_rela_p : 1;
1277 /* Whether the default relocation type is RELA. If a backend with
1278 this flag set wants REL relocations for a particular section,
1279 it must note that explicitly. Similarly, if this flag is clear,
1280 and the backend wants RELA relocations for a particular
1282 unsigned default_use_rela_p : 1;
1284 /* True if PLT and copy relocations should be RELA by default. */
1285 unsigned rela_plts_and_copies_p : 1;
1287 /* Set if RELA relocations for a relocatable link can be handled by
1288 generic code. Backends that set this flag need do nothing in the
1289 backend relocate_section routine for relocatable linking. */
1290 unsigned rela_normal : 1;
1292 /* TRUE if addresses "naturally" sign extend. This is used when
1293 swapping in from Elf32 when BFD64. */
1294 unsigned sign_extend_vma : 1;
1296 unsigned want_got_plt : 1;
1297 unsigned plt_readonly : 1;
1298 unsigned want_plt_sym : 1;
1299 unsigned plt_not_loaded : 1;
1300 unsigned plt_alignment : 4;
1301 unsigned can_gc_sections : 1;
1302 unsigned can_refcount : 1;
1303 unsigned want_got_sym : 1;
1304 unsigned want_dynbss : 1;
1306 /* Targets which do not support physical addressing often require
1307 that the p_paddr field in the section header to be set to zero.
1308 This field indicates whether this behavior is required. */
1309 unsigned want_p_paddr_set_to_zero : 1;
1311 /* True if an object file lacking a .note.GNU-stack section
1312 should be assumed to be requesting exec stack. At least one
1313 other file in the link needs to have a .note.GNU-stack section
1314 for a PT_GNU_STACK segment to be created. */
1315 unsigned default_execstack : 1;
1318 /* Information stored for each BFD section in an ELF file. This
1319 structure is allocated by elf_new_section_hook. */
1321 struct bfd_elf_section_data
1323 /* The ELF header for this section. */
1324 Elf_Internal_Shdr this_hdr;
1326 /* The ELF header for the reloc section associated with this
1328 Elf_Internal_Shdr rel_hdr;
1330 /* If there is a second reloc section associated with this section,
1331 as can happen on Irix 6, this field points to the header. */
1332 Elf_Internal_Shdr *rel_hdr2;
1334 /* The number of relocations currently assigned to REL_HDR. */
1335 unsigned int rel_count;
1337 /* The number of relocations currently assigned to REL_HDR2. */
1338 unsigned int rel_count2;
1340 /* The ELF section number of this section. */
1343 /* The ELF section number of the reloc section indicated by
1344 REL_HDR if any. Only used for an output file. */
1347 /* The ELF section number of the reloc section indicated by
1348 REL_HDR2 if any. Only used for an output file. */
1351 /* Used by the backend linker when generating a shared library to
1352 record the dynamic symbol index for a section symbol
1353 corresponding to this section. A value of 0 means that there is
1354 no dynamic symbol for this section. */
1357 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1358 asection *linked_to;
1360 /* Used by the backend linker to store the symbol hash table entries
1361 associated with relocs against global symbols. */
1362 struct elf_link_hash_entry **rel_hashes;
1364 /* A pointer to the swapped relocs. If the section uses REL relocs,
1365 rather than RELA, all the r_addend fields will be zero. This
1366 pointer may be NULL. It is used by the backend linker. */
1367 Elf_Internal_Rela *relocs;
1369 /* A pointer to a linked list tracking dynamic relocs copied for
1373 /* A pointer to the bfd section used for dynamic relocs. */
1377 /* Group name, if this section is a member of a group. */
1380 /* Group signature sym, if this is the SHT_GROUP section. */
1381 struct bfd_symbol *id;
1384 /* For a member of a group, points to the SHT_GROUP section.
1385 NULL for the SHT_GROUP section itself and non-group sections. */
1386 asection *sec_group;
1388 /* A linked list of member sections in the group. Circular when used by
1389 the linker. For the SHT_GROUP section, points at first member. */
1390 asection *next_in_group;
1392 /* The FDEs associated with this section. The u.fde.next_in_section
1393 field acts as a chain pointer. */
1394 struct eh_cie_fde *fde_list;
1396 /* A pointer used for various section optimizations. */
1400 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1401 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1402 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1403 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1404 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1405 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1406 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1407 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1408 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1410 #define xvec_get_elf_backend_data(xvec) \
1411 ((const struct elf_backend_data *) (xvec)->backend_data)
1413 #define get_elf_backend_data(abfd) \
1414 xvec_get_elf_backend_data ((abfd)->xvec)
1416 /* The least object attributes (within an attributes subsection) known
1417 for any target. Some code assumes that the value 0 is not used and
1418 the field for that attribute can instead be used as a marker to
1419 indicate that attributes have been initialized. */
1420 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1422 /* The maximum number of known object attributes for any target. */
1423 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1425 /* The value of an object attribute. The type indicates whether the attribute
1426 holds and integer, a string, or both. It can also indicate that there can
1427 be no default (i.e. all values must be written to file, even zero). */
1429 typedef struct obj_attribute
1431 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1432 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1433 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1435 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1436 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1437 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1444 typedef struct obj_attribute_list
1446 struct obj_attribute_list *next;
1449 } obj_attribute_list;
1451 /* Object attributes may either be defined by the processor ABI, index
1452 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1453 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1454 #define OBJ_ATTR_PROC 0
1455 #define OBJ_ATTR_GNU 1
1456 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1457 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1459 /* The following object attribute tags are taken as generic, for all
1460 targets and for "gnu" where there is no target standard. */
1467 Tag_compatibility = 32
1470 /* Some private data is stashed away for future use using the tdata pointer
1471 in the bfd structure. */
1473 struct elf_obj_tdata
1475 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1476 Elf_Internal_Shdr **elf_sect_ptr;
1477 Elf_Internal_Phdr *phdr;
1478 struct elf_segment_map *segment_map;
1479 struct elf_strtab_hash *strtab_ptr;
1482 unsigned int num_elf_sections; /* elf_sect_ptr size */
1483 int num_section_syms;
1484 asymbol **section_syms; /* STT_SECTION symbols for each section */
1485 Elf_Internal_Shdr symtab_hdr;
1486 Elf_Internal_Shdr shstrtab_hdr;
1487 Elf_Internal_Shdr strtab_hdr;
1488 Elf_Internal_Shdr dynsymtab_hdr;
1489 Elf_Internal_Shdr dynstrtab_hdr;
1490 Elf_Internal_Shdr dynversym_hdr;
1491 Elf_Internal_Shdr dynverref_hdr;
1492 Elf_Internal_Shdr dynverdef_hdr;
1493 Elf_Internal_Shdr symtab_shndx_hdr;
1494 unsigned int symtab_section, shstrtab_section;
1495 unsigned int strtab_section, dynsymtab_section;
1496 unsigned int symtab_shndx_section;
1497 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1498 file_ptr next_file_pos;
1499 bfd_vma gp; /* The gp value */
1500 unsigned int gp_size; /* The gp size */
1502 /* Information grabbed from an elf core file. */
1509 /* A mapping from external symbols to entries in the linker hash
1510 table, used when linking. This is indexed by the symbol index
1511 minus the sh_info field of the symbol table header. */
1512 struct elf_link_hash_entry **sym_hashes;
1514 /* Track usage and final offsets of GOT entries for local symbols.
1515 This array is indexed by symbol index. Elements are used
1516 identically to "got" in struct elf_link_hash_entry. */
1519 bfd_signed_vma *refcounts;
1521 struct got_entry **ents;
1524 /* The linker ELF emulation code needs to let the backend ELF linker
1525 know what filename should be used for a dynamic object if the
1526 dynamic object is found using a search. The emulation code then
1527 sometimes needs to know what name was actually used. Until the
1528 file has been added to the linker symbol table, this field holds
1529 the name the linker wants. After it has been added, it holds the
1530 name actually used, which will be the DT_SONAME entry if there is
1532 const char *dt_name;
1534 /* The linker emulation needs to know what audit libs
1535 are used by a dynamic object. */
1536 const char *dt_audit;
1538 /* Records the result of `get_program_header_size'. */
1539 bfd_size_type program_header_size;
1541 /* Used by find_nearest_line entry point. */
1544 /* Used by MIPS ELF find_nearest_line entry point. The structure
1545 could be included directly in this one, but there's no point to
1546 wasting the memory just for the infrequently called
1547 find_nearest_line. */
1548 struct mips_elf_find_line *find_line_info;
1550 /* A place to stash dwarf1 info for this bfd. */
1551 struct dwarf1_debug *dwarf1_find_line_info;
1553 /* A place to stash dwarf2 info for this bfd. */
1554 void *dwarf2_find_line_info;
1556 /* An array of stub sections indexed by symbol number, used by the
1557 MIPS ELF linker. FIXME: We should figure out some way to only
1558 include this field for a MIPS ELF target. */
1559 asection **local_stubs;
1560 asection **local_call_stubs;
1562 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1564 asection *eh_frame_hdr;
1566 Elf_Internal_Shdr **group_sect_ptr;
1569 /* Number of symbol version definitions we are about to emit. */
1570 unsigned int cverdefs;
1572 /* Number of symbol version references we are about to emit. */
1573 unsigned int cverrefs;
1575 /* Segment flags for the PT_GNU_STACK segment. */
1576 unsigned int stack_flags;
1578 /* Symbol version definitions in external objects. */
1579 Elf_Internal_Verdef *verdef;
1581 /* Symbol version references to external objects. */
1582 Elf_Internal_Verneed *verref;
1584 /* The Irix 5 support uses two virtual sections, which represent
1585 text/data symbols defined in dynamic objects. */
1586 asymbol *elf_data_symbol;
1587 asymbol *elf_text_symbol;
1588 asection *elf_data_section;
1589 asection *elf_text_section;
1591 /* A pointer to the .eh_frame section. */
1592 asection *eh_frame_section;
1594 /* Whether a dyanmic object was specified normally on the linker
1595 command line, or was specified when --as-needed was in effect,
1596 or was found via a DT_NEEDED entry. */
1597 enum dynamic_lib_link_class dyn_lib_class;
1599 /* This is set to TRUE if the object was created by the backend
1603 /* Irix 5 often screws up the symbol table, sorting local symbols
1604 after global symbols. This flag is set if the symbol table in
1605 this BFD appears to be screwed up. If it is, we ignore the
1606 sh_info field in the symbol table header, and always read all the
1608 bfd_boolean bad_symtab;
1610 /* Used to determine if the e_flags field has been initialized */
1611 bfd_boolean flags_init;
1613 /* Symbol buffer. */
1616 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1617 obj_attribute_list *other_obj_attributes[2];
1619 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1620 bfd_boolean (*after_write_object_contents) (bfd *);
1621 void *after_write_object_contents_info;
1623 /* NT_GNU_BUILD_ID note type. */
1624 bfd_size_type build_id_size;
1627 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1628 symbol type. Used to set the osabi field in the ELF header
1630 bfd_boolean has_ifunc_symbols;
1632 /* An identifier used to distinguish different target
1633 specific extensions to this structure. */
1634 enum elf_target_id object_id;
1637 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1639 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1640 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> program_header_size)
1641 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1642 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1643 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1644 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1645 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1646 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1647 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1648 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1649 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1650 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1651 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1652 #define elf_eh_frame_section(bfd) \
1653 (elf_tdata(bfd) -> eh_frame_section)
1654 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1655 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1656 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1657 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1658 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1659 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1660 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1661 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1662 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1663 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1664 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1665 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1666 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1667 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1668 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1669 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1670 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1671 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1672 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1673 #define elf_known_obj_attributes_proc(bfd) \
1674 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1675 #define elf_other_obj_attributes_proc(bfd) \
1676 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1678 extern void _bfd_elf_swap_verdef_in
1679 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1680 extern void _bfd_elf_swap_verdef_out
1681 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1682 extern void _bfd_elf_swap_verdaux_in
1683 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1684 extern void _bfd_elf_swap_verdaux_out
1685 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1686 extern void _bfd_elf_swap_verneed_in
1687 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1688 extern void _bfd_elf_swap_verneed_out
1689 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1690 extern void _bfd_elf_swap_vernaux_in
1691 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1692 extern void _bfd_elf_swap_vernaux_out
1693 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1694 extern void _bfd_elf_swap_versym_in
1695 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1696 extern void _bfd_elf_swap_versym_out
1697 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1699 extern unsigned int _bfd_elf_section_from_bfd_section
1700 (bfd *, asection *);
1701 extern char *bfd_elf_string_from_elf_section
1702 (bfd *, unsigned, unsigned);
1703 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1704 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1705 Elf_External_Sym_Shndx *);
1706 extern const char *bfd_elf_sym_name
1707 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1709 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1711 extern bfd_boolean _bfd_elf_print_private_bfd_data
1713 extern void bfd_elf_print_symbol
1714 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1716 extern unsigned int _bfd_elf_eh_frame_address_size
1717 (bfd *, asection *);
1718 extern bfd_byte _bfd_elf_encode_eh_address
1719 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1720 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1721 extern bfd_boolean _bfd_elf_can_make_relative
1722 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1724 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1725 (const Elf_Internal_Rela *);
1726 extern bfd_vma _bfd_elf_rela_local_sym
1727 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1728 extern bfd_vma _bfd_elf_rel_local_sym
1729 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1730 extern bfd_vma _bfd_elf_section_offset
1731 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1733 extern unsigned long bfd_elf_hash
1735 extern unsigned long bfd_elf_gnu_hash
1738 extern bfd_reloc_status_type bfd_elf_generic_reloc
1739 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1740 extern bfd_boolean bfd_elf_allocate_object
1741 (bfd *, size_t, enum elf_target_id);
1742 extern bfd_boolean bfd_elf_make_generic_object
1744 extern bfd_boolean bfd_elf_mkcorefile
1746 extern bfd_boolean _bfd_elf_make_section_from_shdr
1747 (bfd *, Elf_Internal_Shdr *, const char *, int);
1748 extern bfd_boolean _bfd_elf_make_section_from_phdr
1749 (bfd *, Elf_Internal_Phdr *, int, const char *);
1750 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1751 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1752 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1754 extern void _bfd_elf_link_hash_copy_indirect
1755 (struct bfd_link_info *, struct elf_link_hash_entry *,
1756 struct elf_link_hash_entry *);
1757 extern void _bfd_elf_link_hash_hide_symbol
1758 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1759 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1760 (struct bfd_link_info *, struct elf_link_hash_entry *);
1761 extern bfd_boolean _bfd_elf_link_hash_table_init
1762 (struct elf_link_hash_table *, bfd *,
1763 struct bfd_hash_entry *(*)
1764 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1765 unsigned int, enum elf_target_id);
1766 extern bfd_boolean _bfd_elf_slurp_version_tables
1767 (bfd *, bfd_boolean);
1768 extern bfd_boolean _bfd_elf_merge_sections
1769 (bfd *, struct bfd_link_info *);
1770 extern bfd_boolean _bfd_elf_match_sections_by_type
1771 (bfd *, const asection *, bfd *, const asection *);
1772 extern bfd_boolean bfd_elf_is_group_section
1773 (bfd *, const struct bfd_section *);
1774 extern void _bfd_elf_section_already_linked
1775 (bfd *, struct bfd_section *, struct bfd_link_info *);
1776 extern void bfd_elf_set_group_contents
1777 (bfd *, asection *, void *);
1778 extern asection *_bfd_elf_check_kept_section
1779 (asection *, struct bfd_link_info *);
1780 extern void _bfd_elf_link_just_syms
1781 (asection *, struct bfd_link_info *);
1782 extern void _bfd_elf_copy_link_hash_symbol_type
1783 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1784 extern bfd_boolean _bfd_elf_size_group_sections
1785 (struct bfd_link_info *);
1786 extern bfd_boolean _bfd_elf_fixup_group_sections
1787 (bfd *, asection *);
1788 extern bfd_boolean _bfd_elf_copy_private_header_data
1790 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1791 (bfd *, asymbol *, bfd *, asymbol *);
1792 #define _bfd_generic_init_private_section_data \
1793 _bfd_elf_init_private_section_data
1794 extern bfd_boolean _bfd_elf_init_private_section_data
1795 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1796 extern bfd_boolean _bfd_elf_copy_private_section_data
1797 (bfd *, asection *, bfd *, asection *);
1798 extern bfd_boolean _bfd_elf_write_object_contents
1800 extern bfd_boolean _bfd_elf_write_corefile_contents
1802 extern bfd_boolean _bfd_elf_set_section_contents
1803 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1804 extern long _bfd_elf_get_symtab_upper_bound
1806 extern long _bfd_elf_canonicalize_symtab
1807 (bfd *, asymbol **);
1808 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1810 extern long _bfd_elf_canonicalize_dynamic_symtab
1811 (bfd *, asymbol **);
1812 extern long _bfd_elf_get_synthetic_symtab
1813 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1814 extern long _bfd_elf_get_reloc_upper_bound
1816 extern long _bfd_elf_canonicalize_reloc
1817 (bfd *, sec_ptr, arelent **, asymbol **);
1818 extern asection * _bfd_elf_get_dynamic_reloc_section
1819 (bfd *, asection *, bfd_boolean);
1820 extern asection * _bfd_elf_make_dynamic_reloc_section
1821 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1822 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1824 extern long _bfd_elf_canonicalize_dynamic_reloc
1825 (bfd *, arelent **, asymbol **);
1826 extern asymbol *_bfd_elf_make_empty_symbol
1828 extern void _bfd_elf_get_symbol_info
1829 (bfd *, asymbol *, symbol_info *);
1830 extern bfd_boolean _bfd_elf_is_local_label_name
1831 (bfd *, const char *);
1832 extern alent *_bfd_elf_get_lineno
1834 extern bfd_boolean _bfd_elf_set_arch_mach
1835 (bfd *, enum bfd_architecture, unsigned long);
1836 extern bfd_boolean _bfd_elf_find_nearest_line
1837 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1839 extern bfd_boolean _bfd_elf_find_line
1840 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1841 #define _bfd_generic_find_line _bfd_elf_find_line
1842 extern bfd_boolean _bfd_elf_find_inliner_info
1843 (bfd *, const char **, const char **, unsigned int *);
1844 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1845 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1846 extern int _bfd_elf_sizeof_headers
1847 (bfd *, struct bfd_link_info *);
1848 extern bfd_boolean _bfd_elf_new_section_hook
1849 (bfd *, asection *);
1850 extern bfd_boolean _bfd_elf_init_reloc_shdr
1851 (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean);
1852 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1853 (const char *, const struct bfd_elf_special_section *, unsigned int);
1854 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1855 (bfd *, asection *);
1857 /* If the target doesn't have reloc handling written yet: */
1858 extern void _bfd_elf_no_info_to_howto
1859 (bfd *, arelent *, Elf_Internal_Rela *);
1861 extern bfd_boolean bfd_section_from_shdr
1862 (bfd *, unsigned int shindex);
1863 extern bfd_boolean bfd_section_from_phdr
1864 (bfd *, Elf_Internal_Phdr *, int);
1866 extern int _bfd_elf_symbol_from_bfd_symbol
1867 (bfd *, asymbol **);
1869 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
1870 (struct sym_cache *, bfd *, unsigned long);
1871 extern asection *bfd_section_from_elf_index
1872 (bfd *, unsigned int);
1873 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1876 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1878 extern void _bfd_elf_strtab_free
1879 (struct elf_strtab_hash *);
1880 extern bfd_size_type _bfd_elf_strtab_add
1881 (struct elf_strtab_hash *, const char *, bfd_boolean);
1882 extern void _bfd_elf_strtab_addref
1883 (struct elf_strtab_hash *, bfd_size_type);
1884 extern void _bfd_elf_strtab_delref
1885 (struct elf_strtab_hash *, bfd_size_type);
1886 extern void _bfd_elf_strtab_clear_all_refs
1887 (struct elf_strtab_hash *);
1888 extern bfd_size_type _bfd_elf_strtab_size
1889 (struct elf_strtab_hash *);
1890 extern bfd_size_type _bfd_elf_strtab_offset
1891 (struct elf_strtab_hash *, bfd_size_type);
1892 extern bfd_boolean _bfd_elf_strtab_emit
1893 (bfd *, struct elf_strtab_hash *);
1894 extern void _bfd_elf_strtab_finalize
1895 (struct elf_strtab_hash *);
1897 extern void _bfd_elf_begin_eh_frame_parsing
1898 (struct bfd_link_info *info);
1899 extern void _bfd_elf_parse_eh_frame
1900 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1901 extern void _bfd_elf_end_eh_frame_parsing
1902 (struct bfd_link_info *info);
1904 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1905 (bfd *, struct bfd_link_info *, asection *,
1906 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1907 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1908 (bfd *, struct bfd_link_info *);
1909 extern bfd_vma _bfd_elf_eh_frame_section_offset
1910 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1911 extern bfd_boolean _bfd_elf_write_section_eh_frame
1912 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1913 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1914 (bfd *, struct bfd_link_info *);
1915 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1916 (struct bfd_link_info *);
1918 extern bfd_boolean _bfd_elf_merge_symbol
1919 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1920 asection **, bfd_vma *, unsigned int *,
1921 struct elf_link_hash_entry **, bfd_boolean *,
1922 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1924 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1926 extern long _bfd_elf_link_lookup_local_dynindx
1927 (struct bfd_link_info *, bfd *, long);
1928 extern bfd_boolean _bfd_elf_compute_section_file_positions
1929 (bfd *, struct bfd_link_info *);
1930 extern void _bfd_elf_assign_file_positions_for_relocs
1932 extern file_ptr _bfd_elf_assign_file_position_for_section
1933 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1935 extern bfd_boolean _bfd_elf_validate_reloc
1938 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1939 (bfd *, struct bfd_link_info *);
1940 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1941 (bfd *, struct bfd_link_info *, asection *);
1942 extern bfd_boolean _bfd_elf_create_dynamic_sections
1943 (bfd *, struct bfd_link_info *);
1944 extern bfd_boolean _bfd_elf_create_got_section
1945 (bfd *, struct bfd_link_info *);
1946 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1947 (bfd *, struct bfd_link_info *, asection *, const char *);
1948 extern void _bfd_elf_init_1_index_section
1949 (bfd *, struct bfd_link_info *);
1950 extern void _bfd_elf_init_2_index_sections
1951 (bfd *, struct bfd_link_info *);
1953 extern bfd_boolean _bfd_elfcore_make_pseudosection
1954 (bfd *, char *, size_t, ufile_ptr);
1955 extern char *_bfd_elfcore_strndup
1956 (bfd *, char *, size_t);
1958 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1959 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1961 extern bfd_boolean _bfd_elf_link_output_relocs
1962 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1963 struct elf_link_hash_entry **);
1965 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
1966 (struct elf_link_hash_entry *, asection *);
1968 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1969 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1971 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1972 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1974 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
1975 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
1977 extern bfd_boolean _bfd_elf_setup_sections
1980 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
1982 extern const bfd_target *bfd_elf32_object_p
1984 extern const bfd_target *bfd_elf32_core_file_p
1986 extern char *bfd_elf32_core_file_failing_command
1988 extern int bfd_elf32_core_file_failing_signal
1990 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1992 extern int bfd_elf32_core_file_pid
1995 extern bfd_boolean bfd_elf32_swap_symbol_in
1996 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1997 extern void bfd_elf32_swap_symbol_out
1998 (bfd *, const Elf_Internal_Sym *, void *, void *);
1999 extern void bfd_elf32_swap_reloc_in
2000 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2001 extern void bfd_elf32_swap_reloc_out
2002 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2003 extern void bfd_elf32_swap_reloca_in
2004 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2005 extern void bfd_elf32_swap_reloca_out
2006 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2007 extern void bfd_elf32_swap_phdr_in
2008 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2009 extern void bfd_elf32_swap_phdr_out
2010 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2011 extern void bfd_elf32_swap_dyn_in
2012 (bfd *, const void *, Elf_Internal_Dyn *);
2013 extern void bfd_elf32_swap_dyn_out
2014 (bfd *, const Elf_Internal_Dyn *, void *);
2015 extern long bfd_elf32_slurp_symbol_table
2016 (bfd *, asymbol **, bfd_boolean);
2017 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2019 extern int bfd_elf32_write_out_phdrs
2020 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2021 extern bfd_boolean bfd_elf32_checksum_contents
2022 (bfd * , void (*) (const void *, size_t, void *), void *);
2023 extern void bfd_elf32_write_relocs
2024 (bfd *, asection *, void *);
2025 extern bfd_boolean bfd_elf32_slurp_reloc_table
2026 (bfd *, asection *, asymbol **, bfd_boolean);
2028 extern const bfd_target *bfd_elf64_object_p
2030 extern const bfd_target *bfd_elf64_core_file_p
2032 extern char *bfd_elf64_core_file_failing_command
2034 extern int bfd_elf64_core_file_failing_signal
2036 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2038 extern int bfd_elf64_core_file_pid
2041 extern bfd_boolean bfd_elf64_swap_symbol_in
2042 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2043 extern void bfd_elf64_swap_symbol_out
2044 (bfd *, const Elf_Internal_Sym *, void *, void *);
2045 extern void bfd_elf64_swap_reloc_in
2046 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2047 extern void bfd_elf64_swap_reloc_out
2048 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2049 extern void bfd_elf64_swap_reloca_in
2050 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2051 extern void bfd_elf64_swap_reloca_out
2052 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2053 extern void bfd_elf64_swap_phdr_in
2054 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2055 extern void bfd_elf64_swap_phdr_out
2056 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2057 extern void bfd_elf64_swap_dyn_in
2058 (bfd *, const void *, Elf_Internal_Dyn *);
2059 extern void bfd_elf64_swap_dyn_out
2060 (bfd *, const Elf_Internal_Dyn *, void *);
2061 extern long bfd_elf64_slurp_symbol_table
2062 (bfd *, asymbol **, bfd_boolean);
2063 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2065 extern int bfd_elf64_write_out_phdrs
2066 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2067 extern bfd_boolean bfd_elf64_checksum_contents
2068 (bfd * , void (*) (const void *, size_t, void *), void *);
2069 extern void bfd_elf64_write_relocs
2070 (bfd *, asection *, void *);
2071 extern bfd_boolean bfd_elf64_slurp_reloc_table
2072 (bfd *, asection *, asymbol **, bfd_boolean);
2074 extern bfd_boolean _bfd_elf_default_relocs_compatible
2075 (const bfd_target *, const bfd_target *);
2077 extern bfd_boolean _bfd_elf_relocs_compatible
2078 (const bfd_target *, const bfd_target *);
2080 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2081 (bfd *, struct bfd_link_info *, const char *);
2082 extern bfd_boolean bfd_elf_link_add_symbols
2083 (bfd *, struct bfd_link_info *);
2084 extern bfd_boolean _bfd_elf_add_dynamic_entry
2085 (struct bfd_link_info *, bfd_vma, bfd_vma);
2087 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2088 (struct bfd_link_info *, struct elf_link_hash_entry *);
2090 extern int bfd_elf_link_record_local_dynamic_symbol
2091 (struct bfd_link_info *, bfd *, long);
2093 extern bfd_boolean _bfd_elf_close_and_cleanup
2096 extern bfd_boolean _bfd_elf_common_definition
2097 (Elf_Internal_Sym *);
2099 extern unsigned int _bfd_elf_common_section_index
2102 extern asection *_bfd_elf_common_section
2105 extern void _bfd_dwarf2_cleanup_debug_info
2108 extern bfd_vma _bfd_elf_default_got_elt_size
2109 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2112 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2113 (bfd *, arelent *, struct bfd_symbol *, void *,
2114 asection *, bfd *, char **);
2116 extern bfd_boolean bfd_elf_final_link
2117 (bfd *, struct bfd_link_info *);
2119 extern void _bfd_elf_gc_keep
2120 (struct bfd_link_info *info);
2122 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2123 (struct elf_link_hash_entry *h, void *inf);
2125 extern bfd_boolean bfd_elf_gc_sections
2126 (bfd *, struct bfd_link_info *);
2128 extern bfd_boolean bfd_elf_gc_record_vtinherit
2129 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2131 extern bfd_boolean bfd_elf_gc_record_vtentry
2132 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2134 extern asection *_bfd_elf_gc_mark_hook
2135 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2136 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2138 extern asection *_bfd_elf_gc_mark_rsec
2139 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2140 struct elf_reloc_cookie *);
2142 extern bfd_boolean _bfd_elf_gc_mark_reloc
2143 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2144 struct elf_reloc_cookie *);
2146 extern bfd_boolean _bfd_elf_gc_mark_fdes
2147 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2148 struct elf_reloc_cookie *);
2150 extern bfd_boolean _bfd_elf_gc_mark
2151 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2153 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2154 (bfd *, struct bfd_link_info *);
2156 extern bfd_boolean bfd_elf_gc_common_final_link
2157 (bfd *, struct bfd_link_info *);
2159 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2162 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2163 (bfd *, asection *);
2165 extern bfd_boolean _bfd_elf_map_sections_to_segments
2166 (bfd *, struct bfd_link_info *);
2168 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2170 extern int bfd_elf_get_default_section_type (flagword);
2172 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2173 (bfd * abfd, asection * section);
2175 /* Exported interface for writing elf corefile notes. */
2176 extern char *elfcore_write_note
2177 (bfd *, char *, int *, const char *, int, const void *, int);
2178 extern char *elfcore_write_prpsinfo
2179 (bfd *, char *, int *, const char *, const char *);
2180 extern char *elfcore_write_prstatus
2181 (bfd *, char *, int *, long, int, const void *);
2182 extern char * elfcore_write_pstatus
2183 (bfd *, char *, int *, long, int, const void *);
2184 extern char *elfcore_write_prfpreg
2185 (bfd *, char *, int *, const void *, int);
2186 extern char *elfcore_write_prxfpreg
2187 (bfd *, char *, int *, const void *, int);
2188 extern char *elfcore_write_xstatereg
2189 (bfd *, char *, int *, const void *, int);
2190 extern char *elfcore_write_ppc_vmx
2191 (bfd *, char *, int *, const void *, int);
2192 extern char *elfcore_write_ppc_vsx
2193 (bfd *, char *, int *, const void *, int);
2194 extern char *elfcore_write_s390_timer
2195 (bfd *, char *, int *, const void *, int);
2196 extern char *elfcore_write_s390_todcmp
2197 (bfd *, char *, int *, const void *, int);
2198 extern char *elfcore_write_s390_todpreg
2199 (bfd *, char *, int *, const void *, int);
2200 extern char *elfcore_write_s390_ctrs
2201 (bfd *, char *, int *, const void *, int);
2202 extern char *elfcore_write_s390_prefix
2203 (bfd *, char *, int *, const void *, int);
2204 extern char *elfcore_write_lwpstatus
2205 (bfd *, char *, int *, long, int, const void *);
2206 extern char *elfcore_write_register_note
2207 (bfd *, char *, int *, const char *, const void *, int);
2209 extern bfd *_bfd_elf32_bfd_from_remote_memory
2210 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2211 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2212 extern bfd *_bfd_elf64_bfd_from_remote_memory
2213 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2214 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2216 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2217 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2218 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2219 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2220 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2221 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2222 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2223 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2224 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2225 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2227 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2228 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2231 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2232 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2233 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2234 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2235 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2237 /* The linker may needs to keep track of the number of relocs that it
2238 decides to copy as dynamic relocs in check_relocs for each symbol.
2239 This is so that it can later discard them if they are found to be
2240 unnecessary. We can store the information in a field extending the
2241 regular ELF linker hash table. */
2243 struct elf_dyn_relocs
2245 struct elf_dyn_relocs *next;
2247 /* The input section of the reloc. */
2250 /* Total number of relocs copied for the input section. */
2251 bfd_size_type count;
2253 /* Number of pc-relative relocs copied for the input section. */
2254 bfd_size_type pc_count;
2257 extern bfd_boolean _bfd_elf_create_ifunc_sections
2258 (bfd *, struct bfd_link_info *);
2259 extern asection * _bfd_elf_create_ifunc_dyn_reloc
2260 (bfd *, struct bfd_link_info *, asection *sec, asection *sreloc,
2261 struct elf_dyn_relocs **);
2262 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2263 (struct bfd_link_info *, struct elf_link_hash_entry *,
2264 struct elf_dyn_relocs **, unsigned int, unsigned int);
2266 /* Large common section. */
2267 extern asection _bfd_elf_large_com_section;
2269 /* Hash for local symbol with the first section id, ID, in the input
2270 file and the local symbol index, SYM. */
2271 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2272 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2273 ^ (SYM) ^ ((ID) >> 16))
2275 /* This is the condition under which finish_dynamic_symbol will be called.
2276 If our finish_dynamic_symbol isn't called, we'll need to do something
2277 about initializing any .plt and .got entries in relocate_section. */
2278 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2280 && ((SHARED) || !(H)->forced_local) \
2281 && ((H)->dynindx != -1 || (H)->forced_local))
2283 /* This macro is to avoid lots of duplicated code in the body
2284 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2285 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2286 r_symndx, symtab_hdr, sym_hashes, \
2287 h, sec, relocation, \
2288 unresolved_reloc, warned) \
2291 /* It seems this can happen with erroneous or unsupported \
2292 input (mixing a.out and elf in an archive, for example.) */ \
2293 if (sym_hashes == NULL) \
2296 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2298 while (h->root.type == bfd_link_hash_indirect \
2299 || h->root.type == bfd_link_hash_warning) \
2300 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2303 unresolved_reloc = FALSE; \
2305 if (h->root.type == bfd_link_hash_defined \
2306 || h->root.type == bfd_link_hash_defweak) \
2308 sec = h->root.u.def.section; \
2310 || sec->output_section == NULL) \
2311 /* Set a flag that will be cleared later if we find a \
2312 relocation value for this symbol. output_section \
2313 is typically NULL for symbols satisfied by a shared \
2315 unresolved_reloc = TRUE; \
2317 relocation = (h->root.u.def.value \
2318 + sec->output_section->vma \
2319 + sec->output_offset); \
2321 else if (h->root.type == bfd_link_hash_undefweak) \
2323 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2324 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2326 else if (!info->relocatable) \
2329 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2330 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2331 if (!info->callbacks->undefined_symbol (info, \
2332 h->root.root.string, \
2335 rel->r_offset, err)) \
2339 (void) unresolved_reloc; \
2344 /* This macro is to avoid lots of duplicated code in the body of the
2345 loop over relocations in xxx_relocate_section() in the various
2348 Handle relocations against symbols from removed linkonce sections,
2349 or sections discarded by a linker script. When doing a relocatable
2350 link, we remove such relocations. Otherwise, we just want the
2351 section contents zeroed and avoid any special processing. */
2352 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2353 rel, relend, howto, contents) \
2355 if (info->relocatable \
2356 && (input_section->flags & SEC_DEBUGGING)) \
2358 /* Only remove relocations in debug sections since other \
2359 sections may require relocations. */ \
2360 Elf_Internal_Shdr *rel_hdr; \
2362 rel_hdr = &elf_section_data (input_section->output_section)->rel_hdr; \
2364 /* Avoid empty output section. */ \
2365 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2367 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2368 rel_hdr = &elf_section_data (input_section)->rel_hdr; \
2369 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2371 memmove (rel, rel + 1, (relend - rel) * sizeof (*rel)); \
2373 input_section->reloc_count--; \
2380 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); \
2382 rel->r_addend = 0; \
2386 /* Will a symbol be bound to the the definition within the shared
2387 library, if any. A unique symbol can never be bound locally. */
2388 #define SYMBOLIC_BIND(INFO, H) \
2389 (!(H)->unique_global \
2390 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2392 #endif /* _LIBELF_H_ */